<template>
	<view>
		<my-search @click="gotoMysearch"></my-search>
		<view class="scroll-view-container">
			<!-- 左侧滑动区域 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height: `${wh}px`}">
				<block v-for="(item, index) in cateList" :key="index">
					<view :class="['left-scroll-view-item', active === index ? 'active' : '']" @click="changeActive(item, index)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧滑动区域 -->
			<scroll-view scroll-y="true" :style="{height: `${wh}px`}" :scroll-top="scrollTop">
				<view class="cate-lv2" v-for="(item, index) in cateLevel2" :key="index">
					<view class="cate-lv2-title">/ {{item.cat_name}} /</view>
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(value, key) in item.children" :key="key" @click="togoGoodList(item)">
							<!-- 图片 -->
							<image :src="value.cat_icon"></image>
							<!-- 文本 -->
							<text>{{value.cat_name}}</text>
						</view>
					</view>
				</view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				wh: 0, // 可使用窗口高度，单位px
				cateList: [],
				active: 0,
				cateLevel2: [],
				scrollTop: 0
			};
		},
		onLoad() {
			const sysInfo = uni.getWindowInfo()
			this.wh = sysInfo.windowHeight - 50
			this.getCateList()
		},
		methods: {
			async getCateList() {
				const { data: res } = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			changeActive(item, index) {
				this.active = index
				this.cateLevel2 = item.children
				this.scrollTop = this.scrollTop ? 0 : 1
			},
			togoGoodList(item) {
				uni.navigateTo({
					url: `/subpak/good_list/good_list?cid=${item.cat_id}`
				})
			},
			gotoMysearch() {
				uni.navigateTo({
					url: '/subpak/search/search'
				})
			}
		}
	}
</script>

<style lang="scss">
.scroll-view-container {
	display: flex;
	.left-scroll-view {
		width: 120px;
		.left-scroll-view-item {
			line-height: 60px;
			background-color: #f7f7f7;
			text-align: center;
			font-size: 12px;
			&.active {
				background-color: #fff;
				position: relative;
				&:before {
					content: ' ';
					width: 3px;
					height: 30px;
					background-color: #ff0000;
					position: absolute;
					top: 50%;
					left: 0;
					transform: translateY(-50%);
				}
			}
		}
	}
	.cate-lv2-title {
		font-size: 12px;
		font-weight: bold;
		text-align: center;
		padding: 15px 0;
	}
	.cate-lv3-list {
		display: flex;
		flex-wrap: wrap;
		.cate-lv3-item {
			width: 33.33%;
			margin-bottom: 10px;
			display: flex;
			flex-direction: column;
			align-items: center;
				image {
					width: 60px;
					height: 60px;
				}
				text {
					font-size: 12px;
				}
		}
	}
}
</style>
